<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			* {
				margin: 0;
				padding: 0;
			}

			html {
				height: 100%;
			}

			body {
				width: 60%;
				height: 60%;
				border: 1px solid;
				margin: 100px auto 0;
			}

			#test {
				width: 200px;
				height: 200px;
				background: pink;
				text-align: center;
				font: 30px/100px "微软雅黑";

				/*display: block;*/

				position: absolute;
				left: 0;
				right: 0;
				bottom: 0;
				top: 0;
				margin: auto;

				/*
				第一个时间是“变换的时间”，
				第二个时间是“延迟的时间”
				*/
				transition: 2s 2s width, 3s height;
			}
			
			body:hover #test{
				width: 100px;
				height: 100px;
				border-radius: 50%;
				background: black;
			}
		</style>
	</head>
	<body>
		<div id="test"></div>
	</body>
</html>
